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hep-th2025
Phase Space Formulation of S-matrix
Joon-Hwi Kim
We establish an exact relation between the S-symplectomorphism and the S-matrix by means of the phase space formulation of quantum mechanics. The adjoint action of the S-matrix def…
hep-th2025
Double copy and the double Poisson bracket
Joon-Hwi Kim
We derive first-order and second-order field equations from ambitwistor spaces as phase spaces of massless particles. In particular, the second-order field equations of Yang-Mills…
hep-th2025
Worldline formalism in phase space
Joon-Hwi Kim
We implement the worldline formalism in phase space to compute scattering amplitudes. First, the Feynman rules exhibit several useful universal features, reflecting elements of the…